Tweak prePublish script

Author: Luke Bowerman

package.json

@@ -25,7 +25,7 @@
     "build:es": "yarn lerna exec --scope '@looker/*' --stream 'BABEL_ENV=build babel src --root-mode upward --out-dir lib --source-maps --extensions .ts,.tsx --no-comments'",
     "build:ts": "yarn lerna exec --stream --scope '@looker/*' --sort 'tsc -b tsconfig.build.json'",
     "clean": "rm -Rf packages/*/lib",
-    "prepublishOnly": "yarn build && yarn test",
+    "prepublishOnly": "yarn build",
     "deploy": "yarn workspace www deploy",
     "playground": "yarn workspace playground start",
     "server": "yarn workspace server start",